Mirrors For Kids Were you ever told about "Bloody Mary" when you were a kid?? Were you scared of mirrors???
I remember when i was like 6 and some girl told me that it happened to her. I was scared of mirrors for the longest!! Especially since I told my mom and aunt and so they did it in the mirror that was in front of my bed! I was scared to go to sleep......silly me ;P
oh of course it's not real. That's why when i remembered right now i realized how silly i was for being so gullible!
Best Refractor Telescopes What's the best refractor telescope for less than $1,200? refractor telescope for under $1,000?
Personally I don't know, but Sky and Telescope magazine reguarly reviews products like this The reviews are very complete, and very honest. Your local public library probably has a subscription, and will have back issues in the shelves.
Telescope Cameras What sort of focusing problem would expect in a real optical instrument such as a camera or telescope now?
that you've done this experiment?
I believe this question was connected to your other question about the refraction of red and blue light. (next time post both of the connected questions together, otherwise without that context, the question doesn't make any sense).
So, in theory you now understand how a lens works, that it can focus light from a source onto a surface. However, if the light is comprised of different colors, the focal length will change somewhat depending on the color. So when a red object is in focus, a blue one at the same distance will be somewhat out of focus, and vice versa.
The challenge, then is to make optics that focus both red and blue light (and the colors in between) at a single focal length so that they are all in focus, which creates a clearer image.
Buy Reflector Telescope Want to buy a telescope for 11 yr old grandson for under $100.?
What is the difference between reflector, refractor, zoom? and what is altazimuth mount? does red-dot projection viewfinder help? what does a diagonal viewer do? will he actually be able to see the rings of Saturn, moons of Jupiter, the moon's craters?
Thanks to each of you for your informative answers. And thank you n2s.astronomy for the child's point of view.
Any telescope selling for under $100 is going to be a toy, not likely to show much. Here is a link to some starter scopes, but I'd really only recommend the first two on the page:
Reflectors use mirrors to form the image, refractors use a lens. Zoom eyepieces should be avoided. Mounts are either equatorial or altazimuth; the latter are much easier to use, and the only kind I recommend for beginners. All of the above scopes are on altazimuth mounts. Every telescope must have some kind of finder because their fields of view are so narrow. A red-dot finder is probably easier to use than an optical finder. Diagonals are only needed on refractors, when looking at objects overhead. Any of the scopes on that page will show Saturn's rings, Jupiter's moons, and the Moon's craters. They will also show bright star clusters, nebulae, and galaxies, once he learns his way around the constellations to find them.
